At least Poser 7 includes a manual, a printed one to boot, but I am somewhat dissapointed that the new features weren't covered in depth.  Other than in the "what's new in Poser 7" few topics are discussed further.  They did go through a good deal of explanation about the new improvements to the library pallate.  

As far as the light set ups, material nodes, and definitions of what renders features do, there is little help where it comes to actually how to set up a node for realistic skin tones for instance, or what render settings to use for the new imaged based lighting system.  That is why I have strongly relied on 3rd party books to help me with things--they are often better than the included documentation.  I love video training because then I can actually see and copy what they are doing.  

Practical Poser 7 is a wealth of helpful insights into Poser and so it The Secrets of Poser Experts.  One of the artists explains her approach to IBLs, but the screen shots are so small I can't tell what node is attached to what.  I would buy Poser 7 Revealed, but Poser 6 Revealed was so very basic that it didn't go far enough in many cases to answer my questions.  If P7 Revealed covers the new features in detail I'll buy it.  It's wonderful that Secrets of Poser Artists and Poser 7 Revealed are so reasonably priced.